package com.ding.dailyup.config;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.converter.Converter;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

@Configuration
public class DateConfig {

	/** 默认日期时间格式 */
	public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
	/** 默认日期格式 */
	public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
	/** 默认时间格式 */
	public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";

	/**
	 * LocalDate转换器，用于转换RequestParam和PathVariable参数
	 */
	@Bean
	public Converter<String, LocalDate> localDateConverter() {
		return new Converter<String, LocalDate>() {
			@Override
			public LocalDate convert(String source) {
				return LocalDate.parse(source,
						DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT));
			}
		};
	}

	/**
	 * LocalDateTime转换器，用于转换RequestParam和PathVariable参数
	 */
	@Bean
	public Converter<String, LocalDateTime> localDateTimeConverter() {
		return new Converter<String, LocalDateTime>() {
			@Override
			public LocalDateTime convert(String source) {
				return LocalDateTime.parse(source,
						DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT));
			}
		};
	}

	/**
	 * LocalTime转换器，用于转换RequestParam和PathVariable参数
	 */
	@Bean
	public Converter<String, LocalTime> localTimeConverter() {
		return new Converter<String, LocalTime>() {
			@Override
			public LocalTime convert(String source) {
				return LocalTime.parse(source,
						DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT));
			}
		};
	}

	/**
	 * Date转换器，用于转换RequestParam和PathVariable参数
	 */
	@Bean
	public Converter<String, Date> dateConverter() {
		return new Converter<String, Date>() {
			@Override
			public Date convert(String source) {
				SimpleDateFormat format = new SimpleDateFormat(
						DEFAULT_DATE_TIME_FORMAT);
				try {
					return format.parse(source);
				} catch (ParseException e) {
					throw new RuntimeException(e);
				}
			}
		};
	}

	/**
	 * Json序列化和反序列化转换器，用于转换Post请求体中的json以及将我们的对象序列化为返回响应的json
	 */
	@Bean
	public ObjectMapper objectMapper() {
		ObjectMapper objectMapper = new ObjectMapper();
		objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
		objectMapper.disable(
				DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);

		// LocalDateTime系列序列化和反序列化模块，继承自jsr310，我们在这里修改了日期格式
		JavaTimeModule javaTimeModule = new JavaTimeModule();
		javaTimeModule.addSerializer(LocalDateTime.class,
				new LocalDateTimeSerializer(
						DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));
		javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(
				DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));
		javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(
				DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
		javaTimeModule.addDeserializer(LocalDateTime.class,
				new LocalDateTimeDeserializer(
						DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));
		javaTimeModule.addDeserializer(LocalDate.class,
				new LocalDateDeserializer(
						DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));
		javaTimeModule.addDeserializer(LocalTime.class,
				new LocalTimeDeserializer(
						DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));

		// Date序列化和反序列化
		javaTimeModule.addSerializer(Date.class, new JsonSerializer<Date>() {
			@Override
			public void serialize(Date date, JsonGenerator jsonGenerator,
					SerializerProvider serializerProvider) throws IOException {
				SimpleDateFormat formatter = new SimpleDateFormat(
						DEFAULT_DATE_TIME_FORMAT);
				String formattedDate = formatter.format(date);
				jsonGenerator.writeString(formattedDate);
			}
		});
		javaTimeModule.addDeserializer(Date.class,
				new JsonDeserializer<Date>() {
					@Override
					public Date deserialize(JsonParser jsonParser,
							DeserializationContext deserializationContext)
							throws IOException, JsonProcessingException {
						SimpleDateFormat format = new SimpleDateFormat(
								DEFAULT_DATE_TIME_FORMAT);
						String date = jsonParser.getText();
						try {
							return format.parse(date);
						} catch (ParseException e) {
							throw new RuntimeException(e);
						}
					}
				});

		objectMapper.registerModule(javaTimeModule);
		return objectMapper;
	}
}